Audio Amplifier in portable systems (i.e. Mobile Phones) or in thermally close environment (i.e. car radio) faced the historical problem of low efficiency while using linear amplifier classical approach such as Class A/B/AB. In latest year the adoption of Class-D switching amplifier has been widely accepted for their higher efficiency (∼90%) thus removing the problem of wasting power and thermal dissipation. Moreover, latest smartphone business creates new multimedia experience requiring more and more loudness with small speaker. This leaded to an explosion of R&D activity to linearize the Class-D amplifier's behavior and improve mixed-signal solution with a clear benefit of sub-nm lithography. In this lecture the latest design development for portable system is described showing all design solution for improving audio quality, speaker's safety and loudness.
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机译：便携式系统中的音频放大器（即移动电话）或在热密的环境中（即汽车收音机）面临低效率的历史问题，而使用线性放大器经典方法，例如A / B / AB等级。在最新一年中，D类开关放大器的采用已被广泛接受其较高效率（〜90％），从而消除了浪费功率和热耗散的问题。此外，最新的智能手机业务创造了新的多媒体体验，需要越来越多的小扬声器。这导致研发活动的爆炸，以线性化-DS-D放大器的行为，并通过Sub-NM光刻的清晰益处来改进混合信号解决方案。在这篇讲座中，描述了便携式系统的最新设计开发，显示了用于提高音频质量，扬声器的安全性和响度的所有设计解决方案。
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